#ifndef DRACO_CORE_BIT_CODERS_SYMBOL_BIT_DECODER_H_
#define DRACO_CORE_BIT_CODERS_SYMBOL_BIT_DECODER_H_

#include <algorithm>
#include <vector>

#include "draco/core/decoder_buffer.h"

namespace draco {

// Class for decoding bits using the symbol entropy encoding. Wraps
// |DecodeSymbols|. Note that this uses a symbol-based encoding scheme for
// encoding bits.
class SymbolBitDecoder {
  public:
    // Sets |source_buffer| as the buffer to decode bits from.
    bool StartDecoding(DecoderBuffer *source_buffer);

    // Decode one bit. Returns true if the bit is a 1, otherwise false.
    bool DecodeNextBit();

    // Decode the next |nbits| and return the sequence in |value|. |nbits| must be
    // > 0 and <= 32.
    void DecodeLeastSignificantBits32(int nbits, uint32_t *value);

    void EndDecoding() {
        Clear();
    }

  private:
    void Clear();

    std::vector<uint32_t> symbols_;
};

}  // namespace draco

#endif  // DRACO_CORE_BIT_CODERS_SYMBOL_BIT_DECODER_H_
